Kramer, F.; Knobloch, J.; Kugeler, O.; Köszegi, J.-M.: Mapping Flux Trapping in SRF Cavities to Analyze the Impact of Geometry. In: Peter Michel ... [Ed.] : SRF2019, Proceedings of the 19th International Conference on RF Superconductivity, Dresden, GermanyGeneve: JaCOW, 2019. - ISBN 978-3-95450-211-0, p. TUFUB3/87-89
http://accelconf.web.cern.ch/AccelConf/srf2019/papers/tufub3.pdf
Open Access Version
Abstract:
A combined temperature and magnetic field mapping system was used to investigate the impact of an ambient field on trapped flux and on the resulting local surface resistance. For this, a 1.3 GHz TESLA single cell cavity was cooled through the superconducting transition at different magnetic field angles with respect to the cavity axis. The measurements suggest, that the field is trapped homogeneously over the cavity volume, without changing its orientation. Flux trapped perpendicular the surface contributed significantly more to the surface resistance, than trapped flux parallel to the surface.